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CHATTANOOGA, Tenn. (CBS News) — A gunman unleashed a barrage of gunfire at two military facilities Thursday in Tennessee, killing at least four Marines and wounding a soldier and a police officer, officials told CBS News. The suspect also was killed.

Chattanooga Mayor Andy Berke said five people died in all, including the gunman. Two law enforcement sources told CBS News that the shooting suspect was identified as Muhammad Youssef Abdulazeez.

Photo, CBS

U.S. Attorney Bill Killian said officials were treating the attacks as an “act of domestic terrorism,” though FBI Special Agent in Charge Ed Reinhold said authorities were still investigating a motive.

Officials told CBS News correspondent David Marin that four U.S. Marines were among the dead and another was injured. The U.S. Marines released a statement saying that the injured Marine was a recruiter who treated and released after sustaining a wound to the leg.

A police officer also was shot in the ankle and is expected to be ok.

“Lives have been lost from some faithful people who have been serving our country, and I think I join all Tennesseans in being both sickened and saddened by this,” Gov. Bill Haslam said.

A facility 7 miles away on Old Lee Highway also was attacked. Brian Lepley, a spokesman with the U.S. Army Recruiting Command in Fort Knox, Kentucky, said his recruiters there were told by law enforcement that the shooter was in a car, stopped in front of the facility, shot at the building and drove off.

The Army recruiters at the facility told Lepley they were not hurt and had evacuated; Lepley said he had no information about recruiters for the other branches at the facility.

Sgt. 1st Class Robert Dodge, 36, is the center leader for U.S. Army recruiting at the facility on Old Lee Highway. He said four Army personnel were in the office at the time. He said the Air Force, Navy, Marine Corps and National Guard all have their own offices right next to each other. Around 10:30 or 10:45 a.m., Dodge and the others heard a gunshot, “which kind of sparked our attention,” he said.

“Shortly after that, just a few seconds, the shooter began shooting more rounds. We realized it was an actual shooting,” he said. They then got on the ground and barricaded themselves in a safe place. Dodge estimated there were 30 to 50 shots fired.

He did not see the shooter or a vehicle.

The Army recruiting office was not damaged, but doors and glass were damaged at the neighboring Air Force, Navy and Marine offices.

Reinhold said all the dead were killed at the Navy Operational Support Center and Marine Corps Reserve Center Chattanooga. It sits between Amnicola Highway and a pathway that runs through Tennessee RiverPark, a popular park at a bend in the Tennessee River northeast of downtown Chattanooga. It’s in a light industrial area that includes a Coca-Cola bottling plant and Binswanger Glass.

The two entrances to the fenced facility have unmanned gates and concrete barriers that require approaching cars to slow down to drive around them.

The Armed Forces Career Center on Lee Highway sits in a short strip between a Cricket Wireless and an Italian restaurant with no apparent additional security.

Near the other shooting location on Lee Highway, Nicholas Donohue heard a blast of gunshots while working at Desktop Solutions. But he had music playing and wasn’t quite sure what the noise had been. He turned off the music and seconds later, a second blast thundered. He took shelter in a back room.

“Even though it knew it was most likely gunfire I heard, you also don’t want to believe it’s happening in the moment,” he said. “Since I didn’t see anything, I couldn’t be sure.”